JP4432272B2 - Internal combustion engine equipped with a heat storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine provided with a heat storage device.
[0002]
[Prior art]
In general, when an internal combustion engine is operated in a state where the temperature around the combustion chamber does not reach a predetermined temperature, deterioration of the atomization of the fuel supplied to the combustion chamber and extinguishing of the flame near the wall occur, resulting in exhaust emission. Getting worse.
[0003]
Therefore, an internal combustion engine having a heat storage device that stores heat generated during operation of the internal combustion engine and supplies the stored heat to the internal combustion engine while the engine is stopped or when the engine is started to increase the temperature of the internal combustion engine is known. It has been. However, since the amount of heat stored in the heat storage device is limited, a technique for efficiently using the limited amount of heat is disclosed.
[0004]
For example, in JP-A-6-185359, a first cooling water passage for introducing cooling water into a cylinder block, and a second cooling water introduced into the cylinder head independently of the cylinder block and connected to a heat storage device. And a cooling water channel.
[0005]
In the heat storage device for an internal combustion engine thus configured, when the internal combustion engine is in a cold state, heat released from the heat storage device is intensively introduced into the cylinder head through the second cooling water channel. Thus, it becomes possible to efficiently use limited heat by intensively introducing the heat stored in the heat storage device into the cylinder head. As a result, the emission performance and fuel efficiency are improved.
[0006]
[Problems to be solved by the invention]
However, since the cooling water passages provided in the cylinder head and the cylinder block communicate with each other, there is a possibility that the cooling water introduced into the cylinder head also flows through the cylinder block. Further, since the cooling water passage communicates with a radiator, a heater core and the like provided outside the internal combustion engine, there is a possibility that the cooling water circulates in such a device. When the cooling water flows through such a place where the supply of heat is not necessary, the temperature of the cooling water is unnecessarily lowered, and the amount of heat stored in the heat storage device is increased. When trying to increase the capacity of the heat storage device in order to solve this problem, a very large device is required and it is difficult to mount on the vehicle, or even if it can be mounted, the fuel consumption deteriorates due to the increase in mass There is a risk of deteriorating performance.
[0007]
By the way, in order to start the internal combustion engine in a warmed state, it is necessary to raise the temperature of the internal combustion engine before starting the internal combustion engine. However, it is difficult to accurately grasp the start timing of the internal combustion engine. Therefore, if the start is delayed for some reason, it is necessary to supply heat to the internal combustion engine for a long period of time. Since the heat that can be stored in the heat storage device is limited, in order to supply heat over a long period of time, it is necessary to efficiently supply the heat stored in the heat storage device.
[0008]
The present invention has been made to solve the above problems, and provides a technique capable of supplying heat to an internal combustion engine for a long time even when the internal combustion engine is stopped. The purpose is to prevent the deterioration of exhaust emissions.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the internal combustion engine provided with the heat storage device of the present invention employs the following means. That is, the first invention according to the present application is:
An internal combustion engine comprising an engine body having a cylinder head and a cylinder block and a heat storage device for storing heat,
A circulation system for circulating the heat medium;
A head portion passage for allowing a heat medium to flow through the cylinder head;
A block section passage for circulating a heat medium in the cylinder block;
A communication passage communicating the head portion passage and the block portion passage;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
Suppression means for suppressing heat medium from flowing through the communication passage when heat is supplied by the heat supply means or when the internal combustion engine is in a cold state;
It is characterized by comprising.
[0010]
In the internal combustion engine including the heat storage device configured as described above, heat generated during operation of the internal combustion engine is stored by the heat storage device even after the operation of the internal combustion engine is stopped. The heat stored by the heat storage device circulates in the circulation system through the heat medium. After the heat medium reaches the internal combustion engine, it passes through a block portion passage, a communication passage, and a head portion passage set inside the internal combustion engine. At this time, the heat medium supplies heat to the internal combustion engine.
[0011]
In this way, the heat storage device loses heat by supplying heat to the internal combustion engine. Further, the internal combustion engine is supplied with heat, and the temperature rises even before the internal combustion engine is started.
[0012]
The said suppression means suppresses the distribution | circulation of the heat medium which is going to pass a communicating path. And it suppresses that a heat medium distribute | circulates to the location which does not need heat supply inside an internal combustion engine. For example, in order to suppress the deterioration of the exhaust emission, it is effective to mainly heat the cylinder head portion. Therefore, the heat medium may not be circulated in the block portion passage. In this way, by limiting unnecessary heat consumption, limited heat stored in the heat storage device can be supplied to the internal combustion engine over a long period of time. Furthermore, it is possible to reduce the size of the heat storage device, and it is possible to shorten the time for supplying heat.
[0013]
The suppression means may completely block the circulation of the heat medium, or may be a throttle or the like that allows the heat medium to circulate to some extent. In addition, the suppression means may have a valve mechanism or the like that can adjust the flow rate of the heat medium, or may be a thermostat valve that automatically opens and closes based on the temperature of the heat medium. . Furthermore, the suppression means may be an electromagnetic valve capable of performing opening / closing control from the outside of the internal combustion engine.
[0014]
The suppression means can eliminate the suppression of the circulation of the heat medium when the internal combustion engine starts operation. Conditions for this cancellation may be before or after starting the internal combustion engine, for example, when a predetermined time has elapsed since the engine was started, or when the heat medium has reached a predetermined temperature.
[0015]
In order to solve the above problems, the second invention according to the present application is:
An internal combustion engine comprising an engine body having a cylinder head and a cylinder block and a heat storage device for storing heat,
A circulation system for circulating the heat medium;
A head portion passage for allowing a heat medium to flow through the cylinder head;
A block section passage for circulating a heat medium in the cylinder block;
A communication passage communicating the head portion passage and the block portion passage;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A flow direction restriction means for restricting the flow direction of the heat medium in the communication path;
It is characterized by comprising.
[0016]
In the internal combustion engine including the heat storage device configured as described above, heat generated during operation of the internal combustion engine is stored by the heat storage device even after the operation of the internal combustion engine is stopped. The heat stored by the heat storage device circulates in the circulation system through the heat medium. After the heat medium reaches the internal combustion engine, it passes through a block portion passage, a communication passage, and a head portion passage set inside the internal combustion engine. At this time, the heat medium supplies heat to the internal combustion engine.
[0017]
In this way, the heat storage device loses heat by supplying heat to the internal combustion engine. Further, the internal combustion engine is supplied with heat, and the temperature rises even before the internal combustion engine is started.
[0018]
The flow direction restriction means restricts the flow direction of the heat medium that is about to pass through the communication path, and suppresses the heat medium from flowing to an unnecessary portion of the heat supply inside the internal combustion engine. In this way, by limiting unnecessary heat consumption, limited heat stored in the heat storage device can be supplied to the internal combustion engine over a long period of time. Furthermore, it is possible to reduce the size of the heat storage device, and it is possible to shorten the time for supplying heat.
[0019]
The flow direction limiting means suppresses the heat medium from flowing from a place where heat supply is required to a place where heat supply is not required inside the internal combustion engine, but conversely, heat supply is required from a place where heat supply is not required. It does not prevent the heat medium from flowing to the location. This is particularly effective when the flow direction of the heat medium is opposite between when heat is supplied from the heat storage device and when the internal combustion engine is operated.
[0020]
The flow direction limiting means may completely block the flow of the heat medium in one direction, or may allow the heat medium to flow to some extent. Further, the circulation amount of the heat medium may be adjusted.
[0021]
The flow direction limiting means can eliminate the suppression of the flow of the heat medium when the internal combustion engine starts operation. This cancellation may be performed before or after the internal combustion engine is started, or may be made conditional on, for example, when a predetermined time has elapsed since the engine was started, or when the heat medium has reached a predetermined temperature.
[0022]
In a second aspect of the invention, the internal combustion engine includes a cylinder head and a cylinder block, and the flow direction restricting means may suppress the flow of the heat medium from the cylinder head side to the cylinder block side.
[0023]
According to the internal combustion engine including the heat storage device configured as described above, when heat is supplied from the heat storage device, the heat medium flows from the cylinder head to the cylinder block, and unnecessary heat is generated in the cylinder block. Can be suppressed.
[0024]
In order to solve the above problems, the third invention according to the present application is
An internal combustion engine equipped with a heat storage device for storing heat,
A circulation system for circulating the heat medium;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A heat exchanger that lowers the temperature of the heat medium by transferring heat;
Communication suppression means for suppressing circulation of the heat medium to the heat exchanger when heat is supplied by the heat supply means or when the internal combustion engine is in a cold state;
It is characterized by comprising.
[0025]
In the internal combustion engine including the heat storage device configured as described above, heat generated during operation of the internal combustion engine is stored by the heat storage device even after the operation of the internal combustion engine is stopped. The heat stored by the heat storage device circulates in the circulation system through the heat medium. After the heat medium reaches the internal combustion engine, it passes through a block portion passage, a communication passage, and a head portion passage set inside the internal combustion engine. At this time, the heat medium supplies heat to the internal combustion engine.
[0026]
The heat exchanger is connected to the internal combustion engine via a circulation system. The internal combustion engine whose temperature has increased during operation releases heat to the heat medium. The heat medium supplied with heat passes through the circulation system and reaches the heat exchanger. In the heat exchanger, heat of the heat medium is released, and the heat medium can be supplied with heat again.
[0027]
However, if the heat medium passes through the heat exchanger while heat is supplied from the heat storage device to the internal combustion engine, the heat stored in the heat storage device is released from the heat exchanger. Since the amount of heat stored in the heat storage device is limited, when heat is released from the heat exchanger, the amount of heat that can be supplied to a place where heat supply is required is reduced. In particular, if the period from the start of the supply of heat to the start of the internal combustion engine becomes longer for some reason, the supply of heat may be repeated, so that heat is released from the heat exchanger each time. Heat is reduced. Then, the period during which heat can be supplied to the internal combustion engine is shortened.
[0028]
Therefore, the communication suppressing means suppresses the heat medium from flowing through the circulation system between the internal combustion engine and the heat exchanger. The communication suppression means may completely block the flow of the heat medium, or may be a throttle or the like that allows the heat medium to flow to some extent. Moreover, the valve mechanism etc. which can adjust the distribution | circulation amount of a heat medium may be sufficient.
[0029]
The communication suppressing means can eliminate the suppression of the flow of the heat medium when the internal combustion engine starts operation. Conditions for this cancellation may be before or after starting the internal combustion engine, for example, when a predetermined time has elapsed since the engine was started, or when the heat medium has reached a predetermined temperature.
[0030]
In the present invention, the heat exchanger may be a heater for heating.
[0031]
In order to solve the above problems, the fourth invention according to the present application is
An internal combustion engine equipped with a heat storage device for storing heat,
A circulation system for circulating the heat medium;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A detour that communicates the inlet side of the circulation system to the internal combustion engine and the outlet side from the engine;
Temperature adjusting means for reintroducing the heat medium that has circulated through the internal combustion engine when the internal combustion engine is in a cold state into the internal combustion engine via a bypass;
When heat is supplied from the heat storage device, communication suppression means for suppressing the circulation of the heat medium to the bypass,
It is characterized by comprising.
[0032]
In the internal combustion engine including the heat storage device configured as described above, heat generated during operation of the internal combustion engine is stored by the heat storage device even after the operation of the internal combustion engine is stopped. The heat stored by the heat storage device circulates in the circulation system through the heat medium. After the heat medium reaches the internal combustion engine, it passes through a block portion passage, a communication passage, and a head portion passage set inside the internal combustion engine. At this time, the heat medium supplies heat to the internal combustion engine.
[0033]
In the circulation system, the detour communicates an inlet side where the heat medium flows into the internal combustion engine and an outlet side where the heat medium flows out from the internal combustion engine. When the temperature of the internal combustion engine is low immediately after starting the internal combustion engine, it is important to raise the temperature of the internal combustion engine at an early stage because exhaust emission may be deteriorated. Therefore, when the internal combustion engine is in a cold state, the temperature adjusting means circulates the heat medium through the bypass in the internal combustion engine so that the heat released from the internal combustion engine is not released by a heat exchanger or the like. In this way, the temperature of the internal combustion engine can be increased quickly.
[0034]
However, if a part of the heat medium circulates in the bypass when heat is supplied from the heat storage device to the internal combustion engine, the heat of the heat medium flowing through the bypass is not supplied to the internal combustion engine. . This reduces the amount of heat supplied to the internal combustion engine. In such a state, even if heat is supplied from the heat storage device, the effect is reduced.
[0035]
The communication suppressing means can suppress the circulation of the heat medium in the bypass and increase the effect when heat is supplied. The communication suppression means may completely block the flow of the heat medium, or may be a throttle or the like that allows the heat medium to flow to some extent. Moreover, the valve mechanism etc. which can adjust the distribution | circulation amount of a heat medium may be sufficient.
[0036]
The communication suppressing means can eliminate the suppression of the flow of the heat medium when the internal combustion engine starts operation. The condition for canceling this may be before or after starting the internal combustion engine, for example, when a predetermined time has elapsed since the engine was started, or when the heat medium has reached a predetermined temperature.
[0037]
In 3rd or 4th invention, the said communication suppression means may be a thermostat valve which opens when it becomes more than predetermined temperature.
[0038]
In the third or fourth aspect of the present invention, the communication suppression unit may be a pressure-sensitive valve that opens according to a pressure difference between the heat medium before and after the communication suppression unit.
[0039]
In the third or fourth invention, the communication suppressing means may be a one-way valve that opens when pressure is applied in a predetermined direction.
[0040]
In the third or fourth invention, the communication suppression means may be an electromagnetic on-off valve.
[0041]
In order to solve the above problems, the sixth invention according to the present application is
An internal combustion engine equipped with a heat storage device for storing heat,
A circulation system for circulating the heat medium;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A detour that communicates the inlet side of the circulation system to the internal combustion engine and the outlet side from the engine;
Temperature adjusting means for reintroducing the heat medium that has circulated through the internal combustion engine when the internal combustion engine is in a cold state into the internal combustion engine via a bypass;
Comprising
The heat storage device is interposed in the bypass.
[0042]
In the internal combustion engine including the heat storage device configured as described above, heat generated during operation of the internal combustion engine is stored by the heat storage device even after the operation of the internal combustion engine is stopped. The heat stored by the heat storage device circulates in the circulation system through the heat medium. After the heat medium reaches the internal combustion engine, it passes through a block portion passage, a communication passage, and a head portion passage set inside the internal combustion engine. At this time, the heat medium supplies heat to the internal combustion engine.
[0043]
In the circulation system, the detour communicates an inlet side where the heat medium flows into the internal combustion engine and an outlet side where the heat medium flows out from the internal combustion engine. When the temperature of the internal combustion engine is low immediately after starting the internal combustion engine, it is important to raise the temperature of the internal combustion engine at an early stage because exhaust emission may be deteriorated. Therefore, a bypass is provided to prevent the heat released from the internal combustion engine from being released by a heat exchanger or the like, and the internal combustion engine is circulated through the bypass until the temperature of the heat medium rises to a predetermined temperature. In this way, the temperature of the internal combustion engine can be increased quickly.
[0044]
In the present invention, when the heat storage device supplies heat to the internal combustion engine, a circulation system that circulates the heat medium, and a bypass that bypasses the heat medium when the temperature of the heat medium is low during operation of the internal combustion engine Is a common path.
[0045]
In the sixth aspect of the invention, heat can be supplied to the internal combustion engine while the internal combustion engine is stopped and operating. In addition, the apparatus can be simplified.
[0046]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of a heat storage device for an internal combustion engine according to the present invention will be described with reference to the drawings. Here, the case where the heat storage device for an internal combustion engine according to the present invention is applied to a direct injection gasoline engine for driving a vehicle will be described as an example.
<First Embodiment>
FIG. 1 is a schematic configuration diagram showing an engine 1 to which a heat storage device for an internal combustion engine according to the present invention is applied and cooling water passages (circulation passages) A, B, and C through which the cooling water circulates. The arrow shown in the circulation passage is the flow direction of the cooling water when the engine 1 is operating.
[0047]
The engine 1 shown in FIG. 1 is a water-cooled four-cycle gasoline engine.
[0048]
The outer shell of the engine 1 includes a cylinder head 1a, a cylinder block 1b connected to the lower portion of the cylinder head 1a, and an oil pan 1c connected to the lower portion of the cylinder block 1b.
[0049]
The cylinder head 1a and the cylinder block 1b are provided with a water jacket 23 that is a passage for circulating cooling water. A water pump 6 that sucks cooling water from the outside of the engine 1 and discharges it into the engine 1 is provided at the inlet of the water jacket 23. The water pump 6 is a pump that operates using the rotational torque of the output shaft of the engine 1 as a drive source. That is, the water pump 6 operates only when the engine 1 is operated. Further, an engine internal coolant temperature sensor 29 that transmits a signal corresponding to the temperature of the coolant in the water jacket 23 is attached to the engine 1.
[0050]
The passages for circulating the coolant in the engine 1 are the circulation passage A that circulates the radiator 9, the circulation passage B that circulates the heater core 13, the circulation passage C that circulates the heat storage device 10, and the circulation passage that circulates inside the engine 1. Sorted into D. A part of each circulation passage has a part shared with other circulation passages.
[0051]
The circulation path A mainly has a function of lowering the temperature of the cooling water by releasing the heat of the cooling water from the radiator 9.
[0052]
The circulation passage A includes a radiator inlet-side passage A1, a radiator outlet-side passage A2, a radiator 9, and a water jacket 23. One end of the radiator inlet side passage A1 is connected to the cylinder head 1a, and the other end of the radiator inlet side passage A1 is connected to the inlet of the radiator 9.
[0053]
One end of the radiator outlet side passage A2 is connected to the outlet of the radiator 9, and the other end of the radiator outlet side passage A2 is connected to the cylinder block 1b. On the radiator outlet side passage A2 from the outlet of the radiator 9 to the cylinder block 1b, a thermostat 8 is provided that opens when the temperature of the cooling water reaches a predetermined temperature. Further, the radiator outlet side passage A2 and the cylinder block 1b are connected with a water pump 6 interposed therebetween.
[0054]
The water jacket 23 is classified into a head-side water jacket 23a and a block-side water jacket 23b. The head-side water jacket 23a is a cooling water passage mainly provided in the cylinder head 1a, and aims to cool the cylinder head 1a. The block-side water jacket 23b is a cooling water passage mainly provided in the cylinder block 1b, and aims to cool the cylinder block 1b. The head-side water jacket 23a and the block-side water jacket 23b are communicated with each other via a communication path 23c. The communication passage 23c is provided with a shut-off valve 38 that is opened and closed by a signal from the ECU 22.
[0055]
The circulation passage B mainly has a function of raising the vehicle interior atmosphere temperature by releasing heat of the cooling water from the heater core 13.
[0056]
The circulation passage B includes a heater core inlet side passage B1, a heater core outlet side passage B2, a heater core 13, and a water jacket 23. One end of the heater core inlet side passage B1 is connected in the middle of the radiator inlet side passage A1. A part of the heater core inlet side passage B1 from the cylinder head 1a to the connecting portion is shared with the radiator inlet side passage A1. The other end of the heater core inlet side passage B <b> 1 is connected to the inlet of the heater core 13. A shutoff valve 31 that opens and closes in response to a signal from the ECU 22 is interposed in the heater core inlet side passage B1. One end of the heater core outlet side passage B2 is connected to the outlet of the heater core 13, and the other end of the heater core outlet side passage B2 is connected between the thermostat 8 and the water pump 6 in the middle of the radiator outlet side passage A2. . The passage from the connecting portion to the cylinder block 1b is shared with the radiator outlet side passage A2. Furthermore, the water jacket 23 is also shared.
[0057]
The circulation passage C mainly has a function of accumulating heat of the cooling water and releasing the stored heat to warm the engine 1.
[0058]
The circulation passage C includes a heat storage device inlet-side passage C1, a heat storage device outlet-side passage C2, the heat storage device 10, and a water jacket 23. One end of the heat storage device inlet-side passage C1 is connected in the middle of the radiator outlet-side passage A2. The passage from the cylinder head 1a to this connecting portion is shared with the circulation passages A and B. The other end of the heat storage device inlet-side passage C <b> 1 is connected to the inlet of the heat storage device 10. One end of the heat storage device outlet side passage C2 is connected to the outlet of the heat storage device 10, and the other end of the heat storage device outlet side passage C2 is connected in the middle of the radiator inlet side passage A1. Inside the engine 1, the circulation passages A and B and the water jacket 23 are partially shared. Further, a check valve 11 is provided at the inlet and outlet of the heat storage device 10 for circulating the cooling water only in the direction of the arrow in FIG. Inside the heat storage device 10, a heat storage device cooling water temperature sensor 28 that transmits a signal according to the temperature of the cooling water stored in the heat storage device is provided. Furthermore, an electric water pump 12 is interposed in the middle of the heat storage device inlet-side passage C1 and upstream of the check valve 11.
[0059]
The circulation passage D mainly has a function of circulating the cooling water until the cooling water temperature rises when the cooling water temperature is low. The circulation path D is composed of a water jacket 23 and a bypass 23d. One end of the detour 23d is connected to the outlet side of the head-side water jacket 23a. On the other hand, the other end of the bypass 23 d is connected to the inlet of the water pump 6, and a thermostat 8 is interposed in front of the water pump 6.
[0060]
In the circulation passage configured as described above, in the circulation passage A, when the rotational torque of the crankshaft (not shown) is transmitted to the input shaft of the water pump 6 while the engine 1 is in operation, the water pump 6 Then, the cooling water is discharged at a pressure corresponding to the rotational torque transmitted from the crankshaft to the input shaft of the water pump 6. On the other hand, since the water pump 6 stops while the engine 1 is stopped, the cooling water does not circulate through the circulation passage A.
[0061]
The cooling water discharged from the water pump 6 flows through the water jacket 23. At this time, heat is transferred between the cylinder head 1a and the cylinder block 1b and the cooling water. Part of the heat generated by combustion inside the cylinder (not shown) is transmitted to the cylinder wall surface, and further, the temperature inside the cylinder head 1a and the cylinder block 1b rises along the cylinder head 1a and the cylinder block 1b. A part of the heat transferred to the cylinder head 1a and the cylinder block 1b is transferred to the cooling water inside the water jacket 23 and raises the temperature of the cooling water. Further, the temperature of the cylinder head 1a and the cylinder block 1b that have lost heat correspondingly decreases. In this way, the cooling water whose temperature has risen flows out from the cylinder block 1b to the radiator inlet side passage A1.
[0062]
The cooling water flowing out to the radiator inlet side passage A1 flows into the radiator 9 after flowing through the radiator inlet side passage A1. In the radiator 9, heat is transferred between the outside air and the cooling water. A part of the heat of the cooling water whose temperature is high is transmitted to the wall surface of the radiator 9, further propagates through the inside of the radiator 9, and the temperature of the entire radiator 9 rises. A part of the heat transferred to the radiator 9 is transferred to the outside air and raises the temperature of the outside air. In addition, the temperature of the cooling water that has lost heat correspondingly decreases. The cooling water whose temperature has fallen flows out of the radiator 9.
[0063]
The cooling water flowing out of the radiator 9 flows through the radiator outlet side passage A2 and reaches the thermostat. Here, the thermostat 8 is automatically opened by the thermal expansion of the wax when the temperature of the cooling water flowing through the heater core outlet side passage B2 reaches a predetermined temperature. That is, if the temperature of the cooling water flowing through the heater core outlet side passage B2 does not reach the predetermined temperature, the radiator outlet side passage A2 is blocked, and the cooling water inside the radiator outlet side passage A2 does not pass through the thermostat 8. Can not.
[0064]
When the thermostat 8 is open, the cooling water that has passed through the thermostat 8 flows into the water pump 6.
[0065]
In this way, the thermostat 8 is opened only when the temperature of the cooling water becomes high, and the cooling water circulates through the radiator 9. The cooling water whose temperature has been lowered by the radiator 9 is discharged from the water pump 6 to the water jacket 23 and the temperature rises again.
[0066]
On the other hand, a part of the cooling water flowing through the radiator inlet side passage A1 flows into the heater core inlet side passage B1.
[0067]
The cooling water flowing into the heater core inlet side passage B1 flows through the heater core inlet side passage B1 and reaches the shut-off valve 31. The shut-off valve 31 is opened during operation of the engine 1 and closed when the engine 1 is stopped by a signal from the ECU 22. During operation of the engine 1, the cooling water passes through the shut-off valve 31, flows through the heater core inlet side passage B <b> 1, and reaches the heater core 13.
[0068]
The heater core 13 exchanges heat with air in the vehicle interior, and the air heated by the movement of heat circulates in the vehicle interior by a blower (not shown), and the vehicle interior temperature rises. Thereafter, the cooling water flows out of the heater core 13, flows through the heater core outlet side passage B2, and merges with the radiator outlet side passage A2. At this time, when the thermostat 8 is open, it merges with the cooling water flowing through the circulation passage A and flows into the water pump 6. On the other hand, when the thermostat 8 is closed, the cooling water flowing through the circulation passage B flows into the water pump 6.
[0069]
In this way, the cooling water whose temperature has been lowered by the heater core 13 is again discharged from the water pump 6 to the water jacket 23.
[0070]
By the way, when the cooling water temperature is lower than the predetermined temperature, it is necessary to raise the temperature at an early stage. In such a case, when the cooling water circulates in the radiator 9, the temperature of the cooling water decreases, and it does not reach the predetermined temperature or takes time until the predetermined temperature is reached. In such a case, since the thermostat 8 is automatically closed, the cooling water does not circulate through the radiator 9 and the temperature is not lowered. Further, if the shutoff valve 31 is closed, the cooling water does not circulate through the heater core 13. Furthermore, since check valves 11 are provided before and after the heat storage device 10, cooling water having a low temperature does not flow back into the heat storage device 10.
[0071]
Thus, the cooling water can be circulated only in the circulation passage D when the temperature of the cooling water is low. The cooling water flowing through the circulation passage D is supplied with heat from the engine 1 and gradually rises in temperature. When the coolant temperature obtained from the output signal of the engine coolant temperature sensor 29 becomes higher than a predetermined temperature, the thermostat 8 automatically opens and the coolant releases heat from the radiator 9.
[0072]
Thus, when the temperature of the cooling water is low, the cooling water circulates in the circulation passage D, and when the temperature of the cooling water becomes high, the cooling water is circulated through the circulation passage A, so the temperature of the cooling water is kept substantially constant. be able to.
[0073]
The engine 1 configured as described above is provided with an electronic control unit (ECU) 22 for controlling the engine 1. This ECU 22 controls the operating state of the engine 1 according to the operating conditions of the engine 1 and the driver's request, and also performs a temperature rise control (engine preheat control) of the engine 1 while the operation of the engine 1 is stopped. It is.
[0074]
Various sensors such as a crank position sensor 27, a heat storage device cooling water temperature sensor 28, and an engine cooling water temperature sensor 29 are connected to the ECU 22 through electric wiring, and output signals from the various sensors described above are input to the ECU 22. It has become so.
[0075]
The ECU 22 is connected to the electric water pump 12, the cutoff valve 31, the cutoff valve 38, the cutoff valve 39, etc. so that the electric water pump 12, the cutoff valve 31, the cutoff valve 38, the cutoff valve 39, etc. can be controlled. Connected via electrical wiring.
[0076]
Here, as shown in FIG. 2, the ECU 22 includes a CPU 351, a ROM 352, a RAM 353, a backup RAM 354, an input port 356, and an output port 357 connected to each other by a bidirectional bus 350. An A / D converter (A / D) 355 connected to the input port 356 is provided.
[0077]
The input port 356 receives an output signal of a sensor that outputs a digital signal format signal, such as the crank position sensor 27, and transmits the output signal to the CPU 351 and the RAM 353.
[0078]
The input port 356 is input via an A / D 355 of a sensor that outputs an analog signal format signal such as the heat storage device cooling water temperature sensor 28, the engine cooling water temperature sensor 29, the battery 30, and the like. Are output to the CPU 351 and the RAM 353.
[0079]
The output port 357 is connected to the electric water pump 12, the shut-off valve 31, the shut-off valve 38, the shut-off valve 39, etc. via electric wiring, and the control signal output from the CPU 351 is sent to the electric water pump 12, the shut-off valve described above. 31, the cutoff valve 38, the cutoff valve 39 and the like.
[0080]
The ROM 352 stores application programs such as an engine preheat control routine for supplying heat from the heat storage device 10 to the engine 1.
[0081]
The ROM 352 stores various control maps in addition to the application programs described above. The control map is, for example, a fuel injection amount control map indicating the relationship between the operating state of the engine 1 and the basic fuel injection amount (basic fuel injection time), and the fuel indicating the relationship between the operating state of the engine 1 and the basic fuel injection timing. The injection timing control map is a shutoff valve control map showing the relationship between the cooling water temperature and the open / close state of the shutoff valve 31, shutoff valve 38, and shutoff valve 39.
[0082]
The RAM 353 stores output signals from the sensors, calculation results of the CPU 351, and the like. The calculation result is, for example, the engine speed calculated based on the time interval at which the crank position sensor 27 outputs a pulse signal. These data are rewritten to the latest data every time the crank position sensor 27 outputs a pulse signal.
[0083]
The backup RAM 354 is a non-volatile memory capable of storing data even after the engine 1 is stopped.
[0084]
Next, the outline of temperature increase control (hereinafter referred to as “engine preheat control”) of the engine 1 according to the present embodiment will be described.
[0085]
During operation of the engine 1, when the ECU 22 sends a signal to the electric water pump 12 and operates the electric water pump 12, the cooling water circulates in the circulation passage C.
[0086]
A part of the cooling water flowing through the heater core outlet side passage B2 flows into the heat storage device inlet side passage C1. The cooling water that has flowed into the heat storage device inlet-side passage C <b> 1 flows through the heat storage device inlet-side passage C <b> 1 and reaches the electric water pump 12. The electric water pump 12 is operated by a signal from the ECU 22 and discharges cooling water at a predetermined pressure.
[0087]
The cooling water discharged from the electric water pump 12 flows through the heat storage device inlet side passage C <b> 1, passes through the check valve 11, and reaches the heat storage device 10.
[0088]
The heat storage device 10 is provided with a vacuum heat insulation space between the outer container 10a and the inner container 10b, and the cooling water flowing in from the cooling water injection pipe 10c flows out from the cooling water discharge pipe 10d.
[0089]
The cooling water that has flowed into the heat storage device 10 is thermally insulated from the outside. The cooling water that has flowed out of the heat storage device 10 passes through the check valve 11, flows through the heat storage device outlet side passage C2, and flows into the radiator inlet side passage A1.
[0090]
Thus, the cooling water heated by the engine 1 circulates inside the heat storage device 10, and the inside of the heat storage device 10 is filled with cooling water having a high temperature. If the ECU 22 stops the operation of the electric water pump 12 after the engine 1 is stopped, the high-temperature cooling water can be stored in the heat storage device 10. The stored cooling water is suppressed from decreasing in temperature due to the heat retaining effect of the heat storage device 10.
[0091]
The ECU 22 circulates the high-temperature coolant stored in the heat storage device 10 through the circulation passage C while the engine 1 is stopped, and performs temperature rise control of the cylinder head 1a.
[0092]
FIG. 3 is a diagram showing a passage through which the cooling water circulates and a flow direction thereof when heat is supplied from the heat storage device 10 to the engine 1 while the engine 1 is stopped. The coolant flow direction in the head-side water jacket 23a when heat is supplied from the heat storage device 10 to the engine is opposite to the coolant flow direction when the engine 1 is operating.
[0093]
Here, during the execution of the engine preheat control, the shutoff valve 31, the shutoff valve 38, and the shutoff valve 39 are all closed by the ECU 22.
[0094]
The electric water pump 12 operates based on a signal from the ECU 22 and discharges cooling water at a predetermined pressure. The discharged cooling water flows through the heat storage device inlet-side passage C <b> 1, passes through the check valve 11, and reaches the heat storage device 10. At this time, the cooling water flowing into the heat storage device 10 is cooling water whose temperature has decreased while the engine 1 is stopped.
[0095]
The cooling water stored in the heat storage device 10 flows out of the heat storage device 10 through the cooling water discharge pipe 10d. The cooling water flowing out from the heat storage device 10 at this time is cooling water having a high temperature that flows into the heat storage device 10 during operation of the engine 1 and is kept warm by the heat storage device 10. The cooling water flowing out of the heat storage device 10 passes through the check valve 11, flows through the heat storage device outlet side passage C2, and flows into the cylinder head 1a. Here, while the engine 1 is stopped, the shutoff valve 31 is closed by a signal from the ECU 22, so that the cooling water does not circulate in the heater core 13. Further, when the cooling water temperature is higher than the valve opening temperature of the thermostat 8, it is not necessary to supply heat from the heat storage device 10 to the engine 1. That is, the cooling water is circulated while the engine 1 is stopped only when the thermostat 8 is closed. Therefore, the temperature of the cooling water does not decrease by the circulation of the cooling water through the heater core 13 and the radiator 9 and the transfer of heat.
[0096]
The cooling water that has flowed into the cylinder head 1a flows through the head-side water jacket 23a. In the head-side water jacket 23a, heat is exchanged between the cylinder head 1a and the cooling water. A part of the heat of the cooling water is transmitted through the inside of the cylinder head 1a and the temperature of the entire cylinder head 1a is increased. In addition, the temperature of the cooling water that has lost heat correspondingly decreases. Here, while the engine 1 is stopped, the shutoff valve 38 is closed by a signal from the ECU 22, so that the cooling water does not circulate in the block-side water jacket 23b. Therefore, the temperature of the cooling water does not decrease due to the movement of heat in the cylinder block 1b.
[0097]
Further, since the shutoff valve 39 is closed by a signal from the ECU 22 while the engine 1 is stopped, the cooling water does not circulate in the bypass 23d. Therefore, there is no cooling water that returns to the heat storage device 10 without transferring heat with the head-side water jacket 23a.
[0098]
In this way, the cooling water whose temperature has been lowered due to the movement of heat in the head-side water jacket 23a flows out of the cylinder block 1b, flows through the heat storage device inlet-side passage C1, and reaches the electric water pump 12. .
[0099]
As described above, the ECU 22 operates the electric water pump 12 before starting the engine 1 to increase the temperature of the cylinder head 1a (engine preheat control).
[0100]
By the way, in the system applied in the present embodiment, that is, the system in which the heat exchange between the members 1 and 10 is performed by the cooling water circulating between the engine 1 and the heat storage device 10, the cooling water (heat) stored in the heat storage device 10 is used. While water) is supplied to the cylinder head 1a, cooling water also flows into the cylinder block 1b. For this reason, unnecessary heat will be supplied to the cylinder block 1b, and the consumption of the heat stored in the heat storage device 10 will increase. And if there is much heat consumption, the heat in the thermal storage apparatus 10 will be consumed at an early stage, and the period which can warm the cylinder head 1a will become short.
[0101]
Therefore, in the present embodiment, when the heat is supplied, the shutoff valve 38 is closed so that the cooling water does not circulate to the cylinder block 1b. If the cooling water does not circulate in the cylinder block 1b, unnecessary heat consumption can be reduced, and the period during which heat can be supplied to the cylinder head 1a can be extended.
[0102]
Next, a control flow when performing such engine preheat control will be described.
[0103]
FIG. 4 is a flowchart showing the flow of engine preheat control.
[0104]
In step S101, when a trigger signal is input to the ECU 22, the ECU 22 is activated to start this control. Examples of the trigger signal serving as a condition for starting execution of the control include a door opening / closing signal on the driver's seat that is transmitted by a door opening / closing sensor (not shown). Before the vehicle driver starts the engine 1 mounted on the vehicle, an operation of opening the vehicle door and getting on the vehicle is naturally required. Therefore, when it is detected that the vehicle door is opened, the ECU 22 is activated to perform engine preheat control, and when the vehicle driver starts the engine 1, the engine 1 is kept warm.
[0105]
In step S102, the CPU 351 transmits signals to the shutoff valve 31, the shutoff valve 38, and the shutoff valve 39 to close the valves.
[0106]
In step S103, it is determined whether an execution condition for engine preheat control is satisfied. Here, the element used for the determination is an output signal of the engine coolant temperature sensor 29. Based on the output signal of the engine coolant temperature sensor 29, the CPU 351 calculates the coolant temperature Tw in the water jacket 23 and determines whether or not the calculated temperature is lower than a predetermined temperature (for example, 45 ° C.). . When it is determined that the calculated temperature is lower than the predetermined temperature, the process proceeds to step S104 in order to circulate the cooling water to the engine 1. If a negative determination is made, the process proceeds to step S109 without circulating the cooling water.
[0107]
Here, when the temperature in the water jacket 23 is higher than a predetermined temperature (for example, 45 ° C.), the effect is small even if the cooling water is circulated, and the temperature of the engine 1 is increased in order to reduce power consumption. Did not do. The electric power for driving the electric water pump 12 is supplied from the battery 30 mounted on the vehicle. Since this electric power is limited, it is important to reduce the electric power consumption in this way.
[0108]
In step S <b> 104, the CPU 351 accesses the RAM 353 and reads the output signal of the heat storage device cooling water temperature sensor 28.
[0109]
In step S105, the CPU 351 determines a time Tpt for operating the electric water pump 12 based on the output signal of the heat storage device cooling water temperature sensor 28 read in step S103. The output signal of the cooling water temperature sensor 28 in the heat storage device and the time for operating the electric water pump 12 are mapped in advance and stored in the ROM 352. The CPU 351 calculates the time for operating the electric water pump 12 based on the read output signal of the cooling water temperature sensor 28 in the heat storage device and the map, and stores the calculation result in the RAM 353.
[0110]
In step S <b> 106, the CPU 351 supplies power to the electric water pump 12 and operates the electric water pump 12.
[0111]
In step S107, the CPU 351 determines whether or not the time calculated in step S105 has elapsed since the electric water pump 12 started operating in step S106. The CPU 351 accesses the RAM 353 and reads the time that has elapsed since the electric water pump 12 started operating. If this time is longer than the time calculated in step S105, the process proceeds to step S108. If a negative determination is made, the process proceeds to step S106, and the electric water pump 12 is continuously operated.
[0112]
In step S108, the CPU 351 stops the operation of the electric water pump 12.
[0113]
In step S109, the CPU 351 determines whether or not the engine 1 has been started. The CPU 351 can access the RAM 353 and determine whether or not the engine 1 has been started based on the output signal of the crank position sensor 27. When the CPU 351 determines that the engine 1 is operating, the process proceeds to step S113. When the engine 1 is operated, the water pump 6 starts to discharge the cooling water. Therefore, in the head-side water jacket 23a, the cooling water is circulated in a direction opposite to that before the engine 1 is started. On the other hand, if a negative determination is made, the temperature of the engine 1 raised in steps S106 to S108 decreases, and there is a possibility that the temperature needs to be raised again, so the routine proceeds to step S110.
[0114]
In step S110, the CPU 351 determines whether or not the voltage of the battery 30 is higher than a predetermined voltage (for example, 12V). If it is determined that the voltage is higher than the predetermined voltage, the process proceeds to step S111. If a negative determination is made, if the electric water pump 12 is operated, the voltage of the battery 30 further decreases and it becomes difficult to start the engine 1, so that the electric water pump 12 is not operated again, and step S109 is performed. Proceed to
[0115]
In step S <b> 111, the CPU 351 accesses the RAM 353 and reads output signals from the heat storage device coolant temperature sensor 28 and the engine coolant temperature sensor 29.
[0116]
In step S112, it is determined whether or not an execution condition for again raising the temperature of the engine 1 is satisfied. The elements used for the determination here are output signals of the heat storage device cooling water temperature sensor 28 and the engine cooling water temperature sensor 29. Based on the output signal of the engine coolant temperature sensor 29, the CPU 351 calculates the coolant temperature Tw in the water jacket 23, and determines whether the calculated temperature is lower than a predetermined temperature (for example, 30 ° C.). (Execution condition 1). Further, based on the output signals of the heat storage device coolant temperature sensor 28 and the engine coolant temperature sensor 29, the CPU 351 determines whether the coolant temperature Tth in the heat storage device 10 is higher than the coolant temperature Tw in the water jacket 23. It is determined whether or not (execution condition 2). If it is determined that both of these two conditions are satisfied, the process proceeds to step S105 to increase the temperature of the engine 1. On the other hand, if it is determined that any one of the two conditions is not satisfied, the process proceeds to step S109 without circulating the cooling water.
[0117]
Here, when it is determined that any one of the two conditions is not satisfied, the effect is small even if the cooling water is circulated. Further, when the electric water pump 12 is operated when the cooling water temperature in the heat storage device 10 is lower than the cooling water temperature in the water jacket 23, the cooling water temperature in the water jacket 23 decreases, and as a result, the engine 1 The temperature will decrease. Therefore, in such a state, the electric water pump 12 is not operated.
[0118]
In step S113, the CPU 351 sends a signal to the shutoff valve 39 to open the valve. When the engine 1 is started, the water pump 6 starts to discharge the cooling water. When the shut-off valve 39 is opened at such time, the cooling water flows through the bypass 23d, and the cooling water circulates in the circulation passage D.
[0119]
In step S114, it is determined whether or not a heater blower switch (not shown) is turned on. At this time, since the shut-off valve 39 is closed, warm cooling water does not circulate in the heater core 13. Even if the heater blower is operated at this time, the air that is not supplied with heat from the heater core 13 passes through the heater core 13 without being heated. Therefore, the passenger compartment temperature does not increase. Therefore, in such a case, the shutoff valve 39 is opened to circulate the cooling water to the heater core 13. If it is determined that the heater blower switch (not shown) is turned on, the process proceeds to step S115. If a negative determination is made, the process proceeds to step S117.
[0120]
In step S115, it is determined whether or not the coolant temperature Tw in the water jacket 23 is higher than a predetermined temperature. Based on the output signal of the engine coolant temperature sensor 29, the CPU 351 determines whether or not the coolant temperature in the water jacket 23 is higher than a predetermined temperature. If it is determined that this condition is satisfied, the process proceeds to step S116 to supply heat to the heater core 13. On the other hand, if a negative determination is made, the process proceeds to step S114. Even if the cooling water is circulated in this state, since the effect is small, the cooling water is not circulated to the heater core 13.
[0121]
In step S116, the CPU 351 sends a signal to the shutoff valve 31 to open the valve. When the shut-off valve 31 is opened, the cooling water circulates in the circulation passage B. Further, since the cooling water temperature at this time does not reach the valve opening temperature of the thermostat 8, the cooling water does not circulate in the circulation passage A.
[0122]
In step S117, it is determined whether or not the cooling water temperature in the water jacket 23 is higher than a predetermined temperature. Based on the output signal of the engine coolant temperature sensor 29, the CPU 351 determines whether or not the coolant temperature inside the water jacket 23 is higher than a predetermined temperature. If an affirmative determination is made here, the process proceeds to step S118. On the other hand, if a negative determination is made, the process proceeds to step S114. When the temperature is lower than the predetermined temperature, it is necessary to further raise the temperature, so that the cooling water is circulated in a concentrated manner on the head-side water jacket 23a.
[0123]
In step S118, the CPU 351 sends a signal to the shutoff valve 38 to open the valve. Since the cooling water temperature of the cylinder head 1a at this time is sufficiently raised, the deterioration of exhaust emission caused by the low temperature is improved. When the shut-off valve 38 is opened, cooling water is circulated in the cylinder block 1b, and heat is exchanged between the entire engine 1 and the cooling water.
[0124]
And engine preheat control is complete | finished and normal driving | operation control is performed.
[0125]
As described above, according to the present embodiment, the temperature of the cylinder head 1a is intensively raised while performing the on / off valve control of the shutoff valve 31, the shutoff valve 38, and the shutoff valve 39 for the engine 1 in the engine stopped state. It becomes possible to do. Therefore, it is possible to suppress the consumption of the heat stored in the heat storage device 10 by increasing the temperature of the cylinder block 1b or the like where it is not necessary to increase the temperature, and to increase the temperature of the cylinder head 1a over a long period of time. .
[0126]
Moreover, since the heat stored in the heat storage device 10 is used efficiently, the heat stored in the heat storage device 10 can be reduced. Therefore, the heat storage device 10 can be reduced in size. Furthermore, the time for supplying heat can be shortened.
<Second Embodiment>
The engine 1 provided with the heat storage device 10 according to the present embodiment differs from the first embodiment in the following points.
[0127]
In the first embodiment, the shut-off valve 31, the shut-off valve 38, and the shut-off valve 39 are all electromagnetic valves that are actuated by signals from the CPU 351. However, in the second embodiment, instead of the shut-off valve 38, the check valve 41 is configured to allow cooling water to pass only in one direction.
[0128]
As shown in FIG. 5, the direction in which the cooling water can pass is from the cylinder block 1b side to the cylinder head 1a side.
[0129]
In the engine 1 including the heat storage device 10 configured as described above, the cooling water flows in the direction of the arrow in FIG. 5 while the engine 1 is in operation, so the head-side water jacket 23a, the communication passage 23c, and the block-side water jacket. The cooling water circulates in the bypass 23d and the bypass 23d. In this case, the cooling water flowing through the communication path 23 c can pass through the check valve 41.
[0130]
On the other hand, when the cooling water is circulated and the heat is supplied to the engine 1 when the engine 1 is stopped, the cooling water flows in the direction of the arrow in FIG. The cooling water that has flowed into the cylinder head 1a from the radiator inlet-side passage A1 does not flow through the bypass 23d because the shutoff valve 39 is closed. In the check valve 41, the flow direction of the cooling water is opposite to the flow direction allowed by the check valve 41, so that the cooling water passes through the check valve 41 and flows into the block-side water jacket 23b. Never do.
[0131]
Since the basic configuration regarding other hardware is the same as that of the first embodiment, a description thereof will be omitted.
[0132]
Here, in the present embodiment, the shutoff valve 31 and the shutoff valve 39 are closed by the control corresponding to step S102 in the flowchart of FIG. 4 according to the first embodiment. And control of step S117 and step S118 does not need to be performed.
[0133]
Thus, since the number of shut-off valves that must be controlled is smaller than that of the engine 1 including the heat storage device 10 according to the first embodiment, the control and the device can be simplified.
[0134]
In this way, it is possible to intensively raise the temperature of the cylinder head 1a while performing on-off valve control of the shutoff valve 31 and the shutoff valve 39 while the engine 1 is stopped. Therefore, it is possible to suppress the consumption of the heat stored in the heat storage device 10 by increasing the temperature of the cylinder block 1b or the like where it is not necessary to increase the temperature, and to increase the temperature of the cylinder head 1a over a long period of time. .
[0135]
Moreover, since the heat stored in the heat storage device 10 is used efficiently, the heat stored in the heat storage device 10 can be reduced. Therefore, the heat storage device 10 can be reduced in size. Furthermore, the time for supplying heat can be shortened.
[0136]
In the present embodiment, a pressure sensitive valve or a thermostat valve may be used instead of the check valve 41.
[0137]
Here, the pressure sensitive valve opens when the pressure difference before and after the pressure sensitive valve becomes a predetermined value or more. As a premise for using this pressure sensitive valve, the differential pressure before and after the pressure sensitive valve when the electric water pump 12 is operated when the operation of the engine 1 is stopped is smaller than the valve opening differential pressure of the pressure sensitive valve, and the engine 1 is operated. The differential pressure before and after the pressure sensitive valve at the time needs to be larger than the valve opening differential pressure of the pressure sensitive valve. That is, a pressure-sensitive valve that automatically closes when heat is supplied from the heat storage device 10 and opens automatically when the engine 1 starts operation is used.
[0138]
By using a pressure sensitive valve that satisfies this condition, the same effect as when the check valve 41 is used can be obtained.
[0139]
On the other hand, the thermostat valve opens at a predetermined temperature or higher. This thermostat valve does not close completely even when the temperature of the cooling water is low, but allows a small amount of cooling water to pass through. Then, when the heat is supplied from the heat storage device 10 while the engine 1 is stopped, the cooling water having a temperature lower than the opening temperature of the thermostat valve flows, so that the thermostat valve does not open and a small amount of the cooling water flows. Cooling water circulates through the block-side water jacket 23b. At this time, since the cooling water flowing through the block-side water jacket 23b is small, the amount of heat supplied to the cylinder block 1b is suppressed. When the engine 1 is started and the temperature of the cooling water rises, the temperature of the cooling water that passes through the thermostat valve also rises, and the thermostat valve automatically opens, and a large amount of cooling water passes through the block-side water jacket 23b. It comes to circulate. Thus, the same effect as when the check valve 41 is used can be obtained by using the thermostat valve.
[0140]
In the present embodiment, a thermostat valve may be used instead of the shutoff valve 31. The opening temperature of the thermostat valve is set lower than the opening temperature of the thermostat 8.
<Third Embodiment>
The engine 1 provided with the heat storage device 10 according to the present embodiment differs from the first embodiment in the following points.
[0141]
In the first embodiment, the shut-off valve 31, the shut-off valve 38, and the shut-off valve 39 are all electromagnetic valves that are actuated by signals from the CPU 351. However, in the third embodiment, the check valve 42 is configured to allow cooling water to pass only in one direction instead of the shut-off valve 39.
[0142]
As shown in FIG. 6, the direction in which the cooling water flowing through the bypass 23d can pass is the direction flowing from the cylinder head 1a side to the heater core outlet side passage B2 side.
[0143]
In the present embodiment, the flow direction of the cooling water flowing through the circulation passage C is reversed when heat is supplied from the heat storage device 10 to the engine 1. That is, the flow direction of the cooling water flowing through the water jacket 23 is the same during the operation of the engine 1 and when the heat is supplied from the heat storage device 10.
[0144]
Here, the circulation passage C includes a heat storage device inlet-side passage C1, a heat storage device outlet-side passage C2, and a heat storage device 10, and one end of the heat storage device inlet-side passage C1 is connected in the middle of the radiator inlet-side passage A1. . The passage from the cylinder head 1a to this connecting portion is shared with the circulation passages A and B. One end of the heat storage device outlet side passage C2 is connected to the outlet of the heat storage device 10, and the other end of the heat storage device outlet side passage C2 is connected in the middle of the radiator outlet side passage A2.
[0145]
Since the basic configuration regarding other hardware is the same as that of the first embodiment, a description thereof will be omitted.
[0146]
In the engine 1 including the heat storage device 10 configured as described above, when the electric water pump 12 is operating, a part of the cooling water flowing through the radiator inlet-side passage A1 is part of the heat storage device inlet-side passage C1. Flow into. The cooling water that has flowed into the heat storage device inlet-side passage C <b> 1 flows through the heat storage device inlet-side passage C <b> 1 and reaches the electric water pump 12. The electric water pump 12 is operated by a signal from the ECU 22 and discharges cooling water at a predetermined pressure.
[0147]
Thereafter, the cooling water is discharged at a predetermined pressure, flows through the heat storage device inlet side passage C <b> 1, passes through the check valve 11, and reaches the heat storage device 10.
[0148]
And the cooling water which flowed out from the thermal storage apparatus 10 passes the non-return valve 11, distribute | circulates the thermal storage apparatus exit side channel | path C2, and flows into heater core exit side channel | path B2.
[0149]
Here, while the engine 1 is in operation, the cooling water flows in the direction of the arrow in FIG. 6, so that the cooling water circulates through the head side water jacket 23a, the communication path 23c, the block side water jacket 23b, and the detour 23d. In this case, the cooling water flowing through the detour 23d can pass through the check valve 42.
[0150]
FIG. 7 is a diagram illustrating a direction in which the cooling water flows when the cooling water is circulated and heat is supplied when the engine 1 is stopped. The cooling water flows in the direction of the arrow.
[0151]
Since the cooling water flowing through the heater core outlet side passage B2 reaches the check valve 42 from a direction opposite to the direction allowed by the check valve 42, the cooling water cannot pass through the check valve 42. The cooling water flowing into the cylinder block 1b from the heater core outlet side passage B2 flows through the head side water jacket 23a and supplies heat to the cylinder head 1a. Here, since the shut-off valve 38 is closed, the cooling water does not flow through the block-side water jacket 23b.
[0152]
The cooling water supplied with heat by the cylinder head 1a passes through the radiator inlet side passage A1 and reaches the electric water pump 12. Here, since the shutoff valve 31 is closed, the cooling water does not pass through the heater core 13 and the temperature does not decrease. Further, since the thermostat 8 is closed, the cooling water does not pass through the radiator 9 and the temperature does not decrease.
[0153]
Here, in the present embodiment, the shut-off valve 31 and the shut-off valve 38 are closed by control corresponding to step S102 in the flowchart of FIG. 4 according to the first embodiment. And it is not necessary to perform control of Step S113.
[0154]
Thus, since the number of shut-off valves that must be controlled is smaller than that of the engine 1 including the heat storage device 10 according to the first embodiment, it is possible to simplify the control and the device.
[0155]
In this way, the temperature of the cylinder head 1a can be intensively increased while the shutoff valve 31 and shutoff valve 38 are controlled while the engine 1 is stopped. Therefore, it is possible to suppress the consumption of the heat stored in the heat storage device 10 by increasing the temperature of the cylinder block 1b or the like where it is not necessary to increase the temperature, and to increase the temperature of the cylinder head 1a over a long period of time. .
[0156]
Moreover, since the heat stored in the heat storage device 10 is used efficiently, the heat stored in the heat storage device 10 can be reduced. Therefore, the heat storage device 10 can be reduced in size. Furthermore, the time for supplying heat can be shortened.
[0157]
In the present embodiment, a pressure sensitive valve or a thermostat valve may be used instead of the check valve 42 as in the second embodiment.
[0158]
In the present embodiment, a thermostat valve may be used instead of the shutoff valve 31. The opening temperature of the thermostat valve is set lower than the opening temperature of the thermostat 8.
<Fourth embodiment>
The engine 1 provided with the heat storage device 10 according to the present embodiment differs from the first embodiment in the following points.
[0159]
In the first embodiment, the circulation passage C and the circulation passage D have some shared portions, but there are also independent passages. However, in the fourth embodiment, the circulation passage C and the circulation passage D are all shared passages. That is, the circulation passage C according to the first embodiment also has the function of the circulation passage D.
[0160]
In the engine 1 including the heat storage device 10 configured as described above, cooling water circulates through the head-side water jacket 23a, the communication passage 23c, the block-side water jacket 23b, and the heat storage device 10 while the engine 1 is in operation.
[0161]
Here, FIG. 8 is a diagram illustrating the flow direction of the cooling water. While the engine 1 is in operation, cooling water flows in the direction of the arrow in FIG.
[0162]
On the other hand, FIG. 9 is a diagram illustrating a coolant flow direction in the case where heat is supplied by circulating coolant while the engine 1 is stopped. Cooling water flows in the direction of the arrow in FIG. At this time, since the shutoff valve 31 is closed, the cooling water does not circulate through the heater core 13. Further, since the thermostat 8 is closed, the cooling water does not circulate to the radiator 9. Further, since the shutoff valve 38 is also closed, the cooling water does not circulate in the block-side water jacket 23b.
[0163]
Since the basic configuration regarding other hardware is the same as that of the first embodiment, a description thereof will be omitted.
[0164]
Here, in the present embodiment, the shut-off valve 31 and the shut-off valve 38 are closed by control corresponding to step S102 in the flowchart of FIG. 4 according to the first embodiment. And it is not necessary to perform control of Step S113.
[0165]
Thus, since the number of shut-off valves that must be controlled is smaller than that of the engine 1 including the heat storage device 10 according to the first embodiment, it is possible to simplify the control and the device.
[0166]
In this way, the temperature of the cylinder head 1a can be intensively increased while the shutoff valve 31 and shutoff valve 38 are controlled while the engine 1 is stopped. Therefore, it is possible to suppress the consumption of the heat stored in the heat storage device 10 by increasing the temperature of the cylinder block 1b or the like where it is not necessary to increase the temperature, and to increase the temperature of the cylinder head 1a over a long period of time. . Further, since the circulation passage C and the circulation passage D can be made common, the apparatus can be simplified.
[0167]
Moreover, since the heat stored in the heat storage device 10 is used efficiently, the heat stored in the heat storage device 10 can be reduced. Therefore, the heat storage device 10 can be reduced in size. Furthermore, the time for supplying heat can be shortened.
[0168]
In the present embodiment, a thermostat valve may be used instead of the shutoff valve 31. The opening temperature of the thermostat valve is set lower than the opening temperature of the thermostat 8.
<Fifth embodiment>
FIG. 10 is a diagram showing a schematic configuration of the cooling water circulation passages A, B, C, and D in which the engine 1 provided with the heat storage device 10 according to the present embodiment and the cooling water as the heat medium circulate. The arrow shown in the circulation passage is the flow direction of the cooling water when the engine 1 is operating.
[0169]
The engine 1 provided with the heat storage device 10 according to the present embodiment differs from the first embodiment in the following points.
[0170]
That is, the engine 1 provided with the heat storage device 10 according to the present embodiment includes a communication passage C0 that connects the cylinder head 1a and the heat storage device inlet-side passage C1. A shutoff valve 40 that opens and closes in response to a signal from the ECU 22 is interposed in the communication path C0. The shutoff valve 40 is opened when heat is supplied from the heat storage device 10 to the engine 1, and is closed during operation of the engine. In the engine 1, check valves 41 are provided in all communication passages 23c that connect the head-side water jacket 23a and the block-side water jacket 23b. The check valve 41 allows the coolant to flow from the cylinder block 1b side to the cylinder head 1a side.
[0171]
Since the basic configuration regarding other hardware is the same as that of the first embodiment, a description thereof will be omitted.
[0172]
In the circulation passage configured as described above, during the operation of the engine 1, the shutoff valve 40 is closed, and the cooling water is circulated in the same manner as in the first embodiment.
[0173]
FIG. 11 is a view showing a passage through which cooling water circulates and a flow direction thereof when heat is supplied from the heat storage device 10 to the engine 1 while the engine 1 is stopped. The coolant flow direction in the head-side water jacket 23a when heat is supplied from the heat storage device 10 to the engine is opposite to the coolant flow direction during operation of the engine 1.
[0174]
Here, during execution of the engine preheat control, the shutoff valve 31 and the shutoff valve 39 are closed by the ECU 22, and the shutoff valve 40 is opened by the ECU 22.
[0175]
The electric water pump 12 is operated by a signal from the ECU 22 and discharges cooling water at a predetermined pressure. The discharged cooling water flows through the heat storage device inlet-side passage C <b> 1, passes through the check valve 11, and reaches the heat storage device 10. At this time, the cooling water flowing into the heat storage device 10 is cooling water whose temperature has decreased while the engine 1 is stopped.
[0176]
The cooling water stored in the heat storage device 10 flows out of the heat storage device 10 through the cooling water discharge pipe 10d. The cooling water flowing out from the heat storage device 10 at this time is cooling water having a high temperature that flows into the heat storage device 10 during operation of the engine 1 and is kept warm by the heat storage device 10. The cooling water flowing out of the heat storage device 10 passes through the check valve 11, flows through the heat storage device outlet side passage C2, and flows into the cylinder head 1a. Here, while the engine 1 is stopped, the shutoff valve 31 is closed by a signal from the ECU 22, so that the cooling water does not circulate in the heater core 13. Further, when the cooling water temperature is higher than the valve opening temperature of the thermostat 8, it is not necessary to supply heat from the heat storage device 10 to the engine 1. That is, the cooling water is circulated while the engine 1 is stopped only when the thermostat 8 is closed. Therefore, the temperature of the cooling water does not decrease by the circulation of the cooling water through the heater core 13 and the radiator 9 and the transfer of heat.
[0177]
The cooling water that has flowed into the cylinder head 1a flows through the head-side water jacket 23a. In the head-side water jacket 23a, heat is transferred between the cylinder head 1a and the cooling water. A part of the heat of the cooling water is transmitted through the inside of the cylinder head 1a and the temperature of the entire cylinder head 1a is increased. In addition, the temperature of the cooling water that has lost heat correspondingly decreases. Here, since the check valve 41 does not allow the cooling water to flow from the head-side water jacket 23a to the block-side water jacket 23b, the cooling water does not circulate through the block-side water jacket 23b. Therefore, the temperature of the cooling water does not decrease due to the movement of heat in the cylinder block 1b.
[0178]
Further, since the shutoff valve 39 is closed by a signal from the ECU 22 while the engine 1 is stopped, the cooling water does not circulate in the bypass 23d. Therefore, there is no cooling water that returns to the heat storage device 10 without transferring heat with the head-side water jacket 23a.
[0179]
In this way, the cooling water whose temperature has been lowered due to the movement of heat in the head-side water jacket 23a flows out of the cylinder head 1a and flows into the communication path C0. Since the shutoff valve 40 interposed in the communication passage C0 is opened, the cooling water passes through the shutoff valve 40 and flows into the heat storage device inlet side passage C1. The cooling water that has flowed through the heat storage device inlet-side passage C <b> 1 reaches the electric water pump 12.
[0180]
Thus, the temperature of the cylinder head 1a can be raised by operating the electric water pump 12 while the engine 1 is stopped.
[0181]
Here, in the present embodiment, in the control corresponding to step S102 in the flowchart of FIG. 4 according to the first embodiment, the shutoff valve 31 and the shutoff valve 39 are closed, and the shutoff valve 40 is further closed. Is opened. Then, in the control corresponding to step S113, the shut-off valve 39 is opened, and the shut-off valve 40 is further closed. Note that the control in step S117 and step S118 need not be performed.
[0182]
As described above, when heat is supplied from the heat storage device 10, the cylinder head 1 a can be intensively heated while controlling the on / off valves of the shut-off valve 31, shut-off valve 39, and shut-off valve 40. It becomes possible. Therefore, it is possible to suppress the consumption of the heat stored in the heat storage device 10 by supplying heat to the cylinder block 1b, and to raise the temperature of the cylinder head 1a over a long period of time.
[0183]
Moreover, since the heat stored in the heat storage device 10 is used efficiently, the heat stored in the heat storage device 10 can be reduced. Therefore, the heat storage device 10 can be reduced in size. Furthermore, the time for supplying heat can be shortened.
[0184]
In the present embodiment, an electromagnetic shut-off valve, pressure-sensitive valve, or thermostat valve may be used in place of the check valve 41.
[0185]
In the present embodiment, the pressure sensitive valve or the thermostat valve may be used instead of the shutoff valve 39.
[0186]
Further, in the present embodiment, a thermostat valve may be used instead of the shutoff valve 31. The opening temperature of the thermostat valve is set lower than the opening temperature of the thermostat 8.
[0187]
【The invention's effect】
In the internal combustion engine provided with the heat storage device according to the present invention, even if the start of the internal combustion engine is postponed for some reason, the heat supply is intensively supplied to a place where heat supply is required. It can suppress that the temperature of an internal combustion engine falls.
[0188]
Thus, according to the present invention, since the operation of the internal combustion engine can be started at a high temperature, deterioration of exhaust emission can be suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an engine to which a heat storage device for an internal combustion engine according to a first embodiment is applied and a cooling water passage through which cooling water circulates.
FIG. 2 is a block diagram showing an internal configuration of an ECU.
FIG. 3 is a diagram showing a cooling water circulation direction during engine preheat control according to the first embodiment.
FIG. 4 is a flowchart showing a flow of engine preheat control according to the first embodiment.
FIG. 5 is a schematic configuration diagram showing an engine to which a heat storage device for an internal combustion engine according to a second embodiment is applied and a cooling water passage through which the cooling water circulates.
FIG. 6 is a schematic configuration diagram showing an engine to which a heat storage device for an internal combustion engine according to a third embodiment is applied and a cooling water passage through which the cooling water circulates.
FIG. 7 is a diagram showing a coolant circulation direction during engine preheat control according to a third embodiment.
FIG. 8 is a schematic configuration diagram illustrating an engine to which a heat storage device for an internal combustion engine according to a fourth embodiment is applied and a cooling water passage through which the cooling water circulates.
FIG. 9 is a diagram showing a cooling water circulation direction during engine preheat control according to the fourth embodiment.
FIG. 10 is a schematic configuration diagram illustrating an engine to which a heat storage device for an internal combustion engine according to a fifth embodiment is applied and a cooling water passage through which the cooling water circulates.
FIG. 11 is a diagram showing a cooling water circulation direction during engine preheat control according to a fifth embodiment.
[Explanation of symbols]
1. Engine
1a ... Cylinder head
1b ... Cylinder block
1c ... Oil pan
6. Water pump
8 ... Thermostat
9. Radiator
10 ... Heat storage device
10a ... Outer container
10b ... Inner container
10c ... Cooling water injection pipe
10d ... Cooling water extraction pipe
11 ... Check valve
12 ... Electric water pump
13 ... Heater core
22 ... ECU
23 ... Water jacket
23a .. Head side water jacket
23b ・ ・ Block side water jacket
23c ... Communication passage
23d ... Detour
27 ... Crank position sensor
28 ... Cooling water temperature sensor in heat storage device
29 ... Engine coolant temperature sensor
30 ... Battery
31 ... Shut-off valve
38 ... Shut-off valve
39 ... Shut-off valve
40 ... Shut-off valve
41 ... Check valve
42 ... Check valve
A ... Circulation path
A1 ... Radiator entrance side passage
A2 ... Radiator outlet side passage
B ... Circulation passage
B1 ... Heater core inlet side passage
B2 ... Heater core outlet side passage
C ... Circulation passage
C0 ... Communication passage
C1 ... Heat storage device entrance side passage
C2 ... Heat storage device outlet side passage

Claims (10)

An internal combustion engine comprising an engine body having a cylinder head and a cylinder block and a heat storage device for storing heat,
A circulation system for circulating the heat medium;
A head portion passage for allowing a heat medium to flow through the cylinder head;
A block section passage for circulating a heat medium in the cylinder block;
A communication passage communicating the head portion passage and the block portion passage;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
Suppression means for suppressing heat medium from flowing through the communication passage when heat is supplied by the heat supply means or when the internal combustion engine is in a cold state;
An internal combustion engine equipped with a heat storage device. An internal combustion engine comprising an engine body having a cylinder head and a cylinder block and a heat storage device for storing heat,
A circulation system for circulating the heat medium;
A head portion passage for allowing a heat medium to flow through the cylinder head;
A block section passage for circulating a heat medium in the cylinder block;
A communication passage communicating the head portion passage and the block portion passage;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A flow direction restriction means for restricting the flow direction of the heat medium in the communication path;
An internal combustion engine equipped with a heat storage device.   3. The internal combustion engine having a heat storage device according to claim 2, wherein the flow direction restriction means restricts flow of the heat medium from the cylinder head side to the cylinder block side. An internal combustion engine equipped with a heat storage device for storing heat,
A circulation system for circulating the heat medium;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A heat exchanger that lowers the temperature of the heat medium by transferring heat;
Communication suppression means for suppressing circulation of the heat medium to the heat exchanger when heat is supplied by the heat supply means or when the internal combustion engine is in a cold state;
An internal combustion engine equipped with a heat storage device.   The internal combustion engine having a heat storage device according to claim 4, wherein the heat exchanger is a heater for heating. An internal combustion engine equipped with a heat storage device for storing heat,
A circulation system for circulating the heat medium;
Heat supply means for supplying heat stored in the heat storage device to the internal combustion engine via a heat medium circulating in the circulation system;
A detour that communicates the inlet side of the circulation system to the internal combustion engine and the outlet side from the engine;
Temperature adjusting means for reintroducing the heat medium that has circulated through the internal combustion engine when the internal combustion engine is in a cold state into the internal combustion engine via a bypass;
When heat is supplied from the heat storage device, communication suppression means for suppressing the circulation of the heat medium to the bypass,
An internal combustion engine equipped with a heat storage device.   The internal combustion engine having a heat storage device according to claim 4 or 6, wherein the communication suppression means is a thermostat valve that opens when the temperature exceeds a predetermined temperature.   The internal combustion engine equipped with a heat storage device according to claim 4 or 6, wherein the communication suppression means is a pressure-sensitive valve that opens according to a pressure difference between the heat medium before and after the communication suppression means.   The internal combustion engine having a heat storage device according to claim 4 or 6, wherein the communication suppression means is a one-way valve that opens when pressure is applied in a predetermined direction.   The internal combustion engine having a heat storage device according to claim 4 or 6, wherein the communication suppression means is an electromagnetic on-off valve.

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